[Seacrets]

You don't have to tear your motor apart. I had an Evinrude 185 with the same problems. My marine mechanic pumped a descaler thru the block and made the passages look like new, and it ran much cooler. There are products similar to rydlyme on the market. Google them and you'll see how it works. My mechanic didn't take anything apart on my motor. I'd call around and chat with some marine mechanics before tearing into your motor. Just my $.02